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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09031c313c8ec322993fda1abeb2b3d49b758e3ec0a6601b8b6ed895ff3f8118' 
  AND token = 'sw4HdUivQJrb+SyF2M6udyl0WRNpd5KqONPqHHzrJqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}